Airlines get a bad environmental rap for their fuel-burning emissions, but several are taking steps to reduce their mile-high carbon footprints.
The more sophisticated missiles are programmed to steer towards heat (such as that given off by a fuel-burning jet).
What does a dirty-fuel player like Consol want with a clean-burning fuel like natural gas?
This year also saw the debut of the world's first ethanol tycoon, Brazilian billionaire Rubens Ometto Silveira Mello, who has made a fortune distilling processed sugarcane into the clean-burning fuel.
Calculate carbon emissions for a road trip or flight and buy offsets to fund worldwide projects that employ those in poverty, such as tree-planting programmes that hire low-income workers, or projects that help both the poor and the environment by distributing fuel-efficient stoves, as opposed to wood-burning ones used in most homes in developing countries.
The wind folks say that the benefit is a huge job saver and that it improves overall economic productivity, while providing cleaner-burning electric fuel.
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And in buses on the U.S.' West Coast, we're testing hydrogen fuel-cell engines, designed to replace today's oil-burning engines.
The irrefutable reality is that more growth -- the primary objective of capitalism -- means burning more fossil fuel.
Furnaces could no longer emit "dark smoke" and households were offered grants towards the cost of converting their coal-burning grates to smokeless fuel.
Ethanol is not a someday fuel, It is the renewable, clean-burning alternative we have to gasoline today.
The engines increase airflow, creating a more complete burning of the air-fuel mixture--and a more powerful vehicle.
Clean-burning natural gas, he said, will serve as the bridge fuel to take us from reliance on oil and coal to alternatives like solar and wind.
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Importing fossil fuel is one solution, but the environmentally minded Swedes are unhappy about the greenhouse-gas implications of burning more coal, oil and natural gas.
Also, the cleaner burning fuel reduces combustion byproducts over petroleum and diesel, cutting carbon monoxide emissions by an estimated 90%-97%, and nitrogen dioxide emissions by 35%-60%.
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Fossil fuel burning and fertiliser manufacture now take more nitrogen from the atmosphere than all of the planet's nitrogen-fixing microbes - and there are a lot of those bugs out there.
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